n. 1. what you spend in jail, a jail sentence
2. a very real thing based on the movement of matter in the universe. Units of time are measured in something defined axiomatically such as the speed of light and a defined length.

1. I'll have sex with a 16 year old even if I get time for it
2. It takes a certain amount of time for a photon to travel one foot, and under the same conditions it always takes that amount of time.